Gear unit



FIG. 1 is a front perspective view of the gear unit embodying the new design;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a right view thereof;

FIG. 5 is a left view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a top view thereof.

Broken lines represent unclaimed boundaries of the design. Shading lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for the gear unit, as shown and described. 